Fireside Black Jack Vent Free Gas Logs 18 Inch Millivolt Control On/Off Remote Ready - LP are constructed by the highest-quality materials. Charred vent-free logs are an efficient heat source because 100% of the heat generated. It has variable control valve that allows heat adjustment for complete comfort. Its Tall Profile provides a more substantial appearance. Vent-free gas log is for use in a non-combustible wood burning fireplace or approved vent-free firebox. It provide 22,000-33,000 BTUs. It has decorative lava granules.